Hot-blast furnace.



G. E. NORMAN.

HOT BLAST FURNACE.

PLUM-non FILED MAY 18-, 1910.

Patented Nov. 25, 1913.

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Patented Nov. 25, 1913.

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CHARLES ER??? E'tQEtMhfti', CHIGAQG, ILLIHQIS.

Patented or. 55.

ii Serial No. 561$.i1.

To altwlwm it may concern Be itknown that, 1, CHARLES In. Norman,

Illinois, have invented a certain new and usefullmprovement in HotBiast Furnaces. of which the following is a specification.

My inventiorrrelates to improvements in hotblast furnaces and has for its object to .lfpvide a hot blast in the combustion chamr independently of the tire.

It is illustrated in the accompanying drawings when-em" Figure 1 is a section; Fig. 2, a section along the line 2-2 of Fig. 1; Fig. 3, a section along the line 3-3 of Fig. 1; Fig. 4, a rear elevation r'Fig. a detail of the heating device.

Like letters refer to like parts throughout. the several fi *ures.

The grate i is located within the furnace base A having above it the combustion chamber A and below it the ash chamber A. The boiler B is located above the grate A and surrounds the combustion chamber A The steam dome B is connected by means of thepassage with the boiler itand is supported by thecasing B which surrounds the boiler B and is carried by the base A. The partition B between the boiler B and casing B forms the smoke box B which communicates with the combustion" chamber A by means of the passage B. The passage B leads from the smoke box B through the steam dome B to the smoke pipe B in which is located the check draft openingB controlled by the damper B c The air chamber C having, the damper C mounted upon the rod C communicates with the ash box' A by means of the opening 3 and is connected by means of the pipes G with the annular chamber C between the boiler \B and casing B. The passages C connect the chamber C with the combustion chamber A at a point above the grate. The pipes D which are located within the pipes C and held centrally therein by means of the radially rojecting flanges D, have near their bases t e openings D and are closed at theiir lower ends by the lugs D having therethrough the passages 1 in communication with the gas pipe I) and adapted to be controlled by the turn cock D rigidly carried b the rod C". The pilot li ht- D is locate at the base of each pipe and communicates with the gas pipe D by 1 means of the pipe D, and is controlled the valve D". The pipe E leads from the steam dome B to the T E from which leads the ipe E to the pressure gage l? and the p pe E to the usual receptacle E in which is the usual steam diaphragm not shown, carrying the piston E to move the lever arm E upon which is mounted the.adjustable weight E the lever arm E to the damper B The chain E leads from the lever arm E over the pulleys E" tothe damper C the two chains being so arranged thatwhen the damper B is open, owing to the pressure of the steam upon the diaphragm. overcoming the weight E the damper C is closed and vice versa. Y

It. will be evident that while I have shown in my drawings an operative desire, ill many changes might be made both in s shape and arrangement of parts without departing materially fromthe spirit of my invention.

in hot blast furnaces, it has been customary to deliver a supply of hot air to the combustion chamber above the grate. This supply of air. however, has always been heated by the fire in the grate. The object of this hot blast is to prevent the precipitation of free carbon owing to the influx of the supply of cold air above the grate. It has been found, however, that the greatest smoking occurs when the finals first started, at which time the hot blast is not a hotblast, but a. cold blast, .since the fire in the grate has not heated up the apparatus sutii ciently to cause the air to be heated and a great deal of smoking therefore occurs.

In my invention I provide means for heating the blast of air to the combustion chamber quite independent of the fire in the grate and in this manner-1' ani'able tofides liver a blastof hot air to the combustion chamber at the time when it is most needed, that is, when the fire has just been started. This I do automatically by providing an air chamber controlled by a damper responsive to the steam pressure. or other means. nection from such air chamber to the c nbustion chamber and heating means within such connection, said heatin means resr dered automatically operativefiiy the opera tion of the damper. Thus when the damper is open, the heating means are turned on and the air is heated and when the damper is closed, owing to the too great increase of The chain E leads from of the lire alone.

l illustrated this device in connection with w Al burning steam heating plant and i haie hr ted my blast by means of a. gas heater, which is provided with a pilot light which is at all times burning, although the re lighted only when needed. cut that this device would be X to furnace heated by other such as as or oil and it will be eviiat blast might be heated by gas, oil or elrcrricity or any other suitable means.

I claim:

1, The combination with a furnace, of means for supplying air to the combustion cham together with means for heating said air independently of the furnace, said means comprising a pipe and a damper, and

heating means within said pipe, said heating means being operative responsive to the operation of said damper.

2. The combination with a furnace having a combustionchamber-and ash box of an air chamber in communication with the ash box, a damper controlling the air supply to said air chamber, a smoke tine and check damper therein, a passage outside of the furnace leading from the an chamber to the combustion chamber, heating means within such passage for the air as it passes to the combustion chamber, said means ope-alive only when the damper in such air chamber is open.

3; The combination with a furnace having a combustion chamber and an ash box of an air chamber in communication with the ash box, means for controlling the supply of air to said air chamber, a smoke flue and check damper therein, a passage outside of the furnace leading from the air chamber to the combustion chamber, heating means within such passage for the air as it passes to the combustion chamber, said means operative only when air is being supplied to said air chamber.

4. The combination with a furnace having a combustion cnambcr and an ash box of an air chamber in communication with the ash box, means for controlling the supply of air to said air chamber, said means comprising a damper, a smoke fine and check damper therein, a passage outside of the furnace leading from the air chamber to the com- -l =i.|stion chamber, heating means within such passage for the air as it passes to the combustion chamber, said means operative only when air is being supplied to said air chamher.

5. The combination with a furnace having a combustion chamber and an ash box of an air chamber in communication with the ash box, means for controlling the supply of air to said air chamber comprising a damper in said chamber, a smoke flue and check damper therein, a passage outside of the furnace leading from. the air chamber to the combustion chamber, and heating means Within such passage for the air as it passes to the combustion chamber, said means opcrativc only when the damper in such air chamber is open.

6. The combination with a furnace of means for supptring air to the combustion chamber above the grate, means for heating such air when the furnace is cold, and means responsive to conditions in the furnace formeans for heating such air and means re-' JSPOHSH'Q to i'tOUdiblOllS 1n the furnace for progressively interrupting the sup )ly of heating medium as the heat in the mace increases beyond a certain predetermined point.

CHARLES ERWI N NORMAN.

Witnesses:

-FRAI\CXS W. PARKER, J r.,

SOPHIE B. WERNER. 

